<template>

  <el-container class="home-container">
    <!-- 头部区 -->
    <el-header>
      <div>
        <img src="../assets/heima.png">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出
      </el-button>
    </el-header>
    <!-- 页面主体区 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu  background-color="#333744"
                  text-color="#fff" active-text-color="#409EFF"
                  :unique-opened="true"  :collapse="isCollapse"
                  :collapse-transition="false"
                  :router="true"
                  :default-active='activePath'>
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + '' " v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path"
                          v-for="subItem in item.children"
                          :key="subItem.id"
                          @click="saveNavState('/' + subItem.path)">
              <!-- 二级菜单的模板区 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
  export default {
    created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    data() {
      return {
        //左侧菜单数据
        menulist: [],
        iconsObj: {
          '125': 'iconfont icon-user',
          '103': 'iconfont icon-tijikongjian',
          '101': 'iconfont icon-shangpin',
          '102': 'iconfont icon-danju',
          '145': 'iconfont icon-baobiao'
        },
        //是否折叠  false不折叠
        isCollapse:false,
        //被激活的链接地址
        activePath:'',

      }
    },
    methods: {
      logout() {
        window.sessionStorage.clear() //清空Home页面的token
        this.$router.push('/login') //跳转到退出页
      },
      //获取左侧的菜单
      async getMenuList() {
        const {
          data: res
        } = await this.$http.get('menus')
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
        // console.log(this.menulist)
      },
      //点击折叠展开
      toggleCollapse(){
        this.isCollapse = !this.isCollapse
      },
      //保存链接激活状态
      saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath = activePath
      }


    }
  }
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }


  .el-header {
    padding-left: 0;
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    font-size: 20px;

    >div {
      display: flex;
      align-items: center;

      span {
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #333744;

    .el-menu {
      border-right: none;
    }
  }

  .el-main {
    background-color: #eaedf1;
  }

  .iconfont {
    margin-right: 10px;
  }

  .toggle-button{
    background-color: #4a5064;
    text-align: center;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
